Paspalum laeve Michx.

Paspalum plenipilum Nash, in Britton, Man. 73. 1901
Paspalum laeve pilosum Scribn. Bull. Tenn. Exp. Sta. 7: 34. 1894. l^ot P. pilosum Lam. 1791. Paspalum praelongum Nash, in Small, Fl. SKU. S. 74. 1903.
A tufted pubescent perennial with flat leaf-blades and glabrous spikelets. Stems 5-10 dm. tall, simple; leaf-sheaths compressed, tuberculate-hirsute with long spreading hairs; blades 3 dm. long or less, 6-10 mm. wide, erect, flat, hirsute on both surfaces with long spreading hairs; racemes 2-4, spreading or ascending, 4^8 cm. long, the rachis about 1 mm. wide; spikelets singly disposed, oval, about 2.5 mm. long and 2 mm. broad, the first scale wanting, the second and third scales 5-nerved, the lateral nerves near the margin, approximate, the fruiting scale one half as thick as broad or nearly so.
Type locality: [Clifton, Passaic County,] New Jersey.
Distribution : New Jersey to Missouri, and south to Florida and Mississippi.

Paspalum circulare Nash, in Britton, Man. 73. 1901
A tufted perennial with flat leaf-blades and orbicular glabrous spikelets. Stems 5-10 dm. tall, simple; leaf -sheaths compressed, tuberculate-hirsute with spreading or ascending hairs; blades 3 dm. long or less, 5-8 mm. wide, erect, flat, more or less hirsute on both surfaces; racemes 2-4, erect or ascending, 6-10 cm. long, the rachis about 1 mm. wide; spikelets singly disposed, orbicular, about 3 mm. in diameter, the first scale wanting, the second and third scales thin and usually wrinkled when dry, 5-nerved, the lateral nerves near the margin and approximate but quite distinct, the fruiting scale with its thickness one fourth to one third of the diameter.
Type locality : Bergen County, New Jersey. Distribution : New York to Delaware, Missouri, and Texas.

Paspalum laeve Michx. Fl. Bor. Am. 1 : 44. 1803
Paspalum undulosum Le Conte, Jour, de Phys. 91 : 2(84. 1820.
Paspalum Jloridanum Le Conte, Jour, de Phys. 91 : 284. 1820. Not P.Jloridanum Michx. 1803.
Paspalum. angustifolium I^e Conte, Jour, de Phys. 91 : 285. 1820.
Paspalum Leconteanum Schultes, in R. & S. Syst. Veg. Mant. 2 : 168. 1824.
Paspalum punciulaium Bertol. Mem. Accad. Sci. Bologna 2 : 599. 1850.
? Paspalum altemans Steud. Syn. Gram. 26. 1854.
Paspalum laeve undulosum, Vasey, Bull. Torrey Club 13 : 165. 1886.
Paspalum, laeve angustifolium, Vasey, Bull. Torrey Club 13 : 165. 1886.
Paspalum, laeve brevifolium Vasey, Contr. U. S. Nat. Herb. 3 : 18. 1892.
Paspalum australe Nash, in Britton, Man. 1039. 1901.
A nearly glabrous perennial, with few racemes and glabrous spikelets. Stems 3-10 dm. tall, tufted; leaf-sheaths glabrous or hirsute on the margins, compressed; blades 2-6 dm. long. 5-8 mm. broad, fiat, glabrous, or the upper surface with a few hairs; racemes 2-6, 3-10 cm, long, the rachis less than 1 mm. wide; spikelets singly disposed, 2-3 mm. long and 1.8-2.5 mm. wide, oval, the first scale wanting, the second and third scales firm, 5-nerved, the lateral nerves approximate, the fruiting scale yellowish-green, at least half as thick as broad. 183
Type locality : Georgia.
Distribution : Maryland to Kansas, and south to Florida and Texas.

Paspalum longipilum Nash, Bull. N. Y. Bot
Gard. 1 : 435. 1900.
A somewhat tufted perennial with fiat leaf-blades and glabrous spikelets, the leaf-sheaths hirsute with long hairs. Stems 6-8 dm. tall, simple; leaf-sheaths much compressed, keeled, at least the lower ones densely papillose-hirsute with long spreading hairs; blades 2 dm. long or less, less than 1 cm. wide, linear, often folded, erect, rather firm, strongly pubescent on the upper surface with long spreading hairs, nearly glabrous beneath; racemes 2 or 3, ascending, 5-7 cm. long, the rachis flat, somewhat flexuous, about 1 mm. wide; spikelets singly disposed, oval, 2.5-3 mm. long and 2-2.5 mm. wide, the first scale wanting, the second and third scales 5-nerved, the lateral nerves approximate, the fruiting scale yellowish-white.
Type locality : Eustis, I,ake County, Florida. Distribution: Florida.

Perennials, Terrestrial, not aquatic, Rhizomes present, Rhizome short and compact, stems close, Stems nodes swollen or brittle, Stems erect or ascending, Stems geniculate, decumbent, or lax, sometimes rooting at nodes, Stems caespitose, tufted, or clus tered, Stems terete, round in cross section, or polygonal, Stems compressed, flattened, or sulcate, Stem nodes bearded or hairy, Stem internodes solid or spongy, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems with inflorescence 1-2 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly cauline, Leaves conspicuously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly open, or loose, Leaf sheath smooth, glabrous, Leaf sheath hairy, hispid or prickly, Leaf sheath or blade keeled, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blade margins folded, involute, or conduplicate, Leaf blades mostly glabrous, Leaf blades more or less hairy, Leaf blades scabrous, roughened, or wrinkled, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflo rescence a panicle with narrowly racemose or spicate branches, Inflorescence with 2-10 branches, Inflorescence branches 1-sided, Rachis dilated, flat, central axis to which spikelets are attached, Flowers bisexual, Spikelets pedicellate, Spikelets dorsally compressed or terete, Spikelet less than 3 mm wide, Spikelets with 1 fertile floret, Spikelets with 2 florets, Spikelet with 1 fertile floret and 1-2 sterile florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating below the glumes, Spikelets secund, in rows on one side of rachis, Rachilla or pedicel glabrous, Glumes present, empty bracts, Glumes 1 clearly present, the other greatly reduced or absent, Glumes distinctly unequal, Glumes equal to or longer than adjacent lemma, Glume equal to or longer than spikelet, Glumes 3 nerved, Lemma similar in texture to glumes, Lemma 5-7 nerved, Lemma glabrous, Lemma apex truncate, rounded, or obtuse, Lemma awnless, Le mma straight, Palea present, well developed, Palea shorter than lemma, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis white.

Paspalum laeve common name field paspalum, is a plant found in North America.

It is listed as threatened in Connecticut. Paspalum laeve var. circulare, common names round field beadgrass and hairy field beadgrass, is endangered in New York (state).

Paspalum laeve là một loài thực vật có hoa trong họ Hòa thảo. Loài này được Michx. mô tả khoa học đầu tiên năm 1803.